#include <stdio.h>
#pragma pack(1) // 内存对齐
//#pragma pack(n)预编译指令，则所有成员对齐以n字节为准(即偏移量是n的整数倍)
struct Stuct1
{
    char c;
    // int a[6];
    double a;
    double b;
} s1;

int main(void)
{
    struct Stuct1 s1;
    printf("%llu\n", sizeof(s1));
}
